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I am debugging and I get the correct number of items from Server. And It also calls onCreateViewholder and onBindViewHolder as many as the item size.

However, my RecyclerView only show one item in the list.

And most of the problem after my search was when the height of RecyclerView is match_parent. Mine was match_parent as well. So, I changed it to wrap_content. But It gets correct the number of items and correct item data. But can't display the all the times in the Recycler view.

public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> 
 ArrayList<MyData> MyDataArrayList;

 public static class MyViewHolder extends RecyclerView.ViewHolder 
 TextView userId;

 MyViewHolder(View view) 
 super(view);
 Log.d(TAG, "created()");
 tvUserID = view.findViewById(R.id.textview_myitem);
 
 

 public MyAdapter (ArrayList<MyData> myDataArrayList) 
 Log.d(TAG, "new MyAdapter instance created");
 this.myDataArrayList = myDataArrayList;
 

 @Override
 public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) 
 Log.d(TAG, "onCreateViewHolder()");
 View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.my_item, parent, false);

 return new MyViewHolder(v);
 

 @Override
 public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) 
 Log.d(TAG, "onBindViewHolder()=nposition: " + position + ",nitem: " + myDataArrayList.get(position).toString());

 MyViewHolder myViewHolder = (MyViewHolder) holder;

 Log.d(TAG, "getItemCount(): " + getItemCount());
 try 
 String username = myDataArrayList.get(position).getUser();
 myViewHolder.userId.setText(username);
 catch (Exception e) 
 e.printStackTrace();
 
 

 @Override
 public int getItemCount() 
 return myDataArrayList.size();
 

recyclerView = findViewById(R.id.my_recycler_view);
layoutManager = new LinearLayoutManager(MyActivity.this);
myAdapter = new myAdapter(myDataArrayList);
recyclerView.setAdapter(myAdapter);
recyclerView.setLayoutManager(layoutManager);

 <android.support.v7.widget.RecyclerView
 android:id="@+id/my_recycler_view"
 android:layout_width="match_parent"
 android:layout_height="wrap_content" />

this is my_item.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="horizontal">

 <TextView
 android:id="@+id/textview_myitem"
 android:layout_width="match_parent"
 android:layout_height="50dp"
 android:textSize="25dp"
 android:text="username"
 android:gravity="center_vertical"
 android:paddingLeft="15dp" />
</LinearLayout>

What's the prolbem of this?

My_item.xml has width and height of matchparent ,change the height to wrap content.

The problem is in your my_item.xml file.
You have to set android:layout_height="wrap_content" instead of android:layout_height="match_parent"and it will work and display all items.

In existing code, it is also adding all items but due to match_parent you are able to see only one item. If you scroll the RecyclerView then you will be able to see other items as well.

Also, you can keep RecyclerView height as match_parent as per your need.